46 results about "Ferrofluid" patented technology

Disclosed is a substrate processing apparatus including chamber having defined therein a processing space for a processing of a substrate, a substrate support unit disposed in the chamber, a gas supply unit configured to supply gas to the interior of the chamber, a plasma generation unit including a high-frequency power supply configured to generate plasma in the processing space, an electromagnet unit configured to generate a magnetic field in the processing space, and a controller. The electromagnet unit includes a coil module and a ferrofluid reservoir disposed adjacent to the coil module. The substrate processing apparatus suppresses heat generation in the coil module and precisely controls a magnetic field.

An apparatus and methods or delivering and controlling magnetic abrasive particles to clean between teeth and at and just below the gum line by removing debris. The apparatus can include a horseshoe-shaped optically clear mouth tray (for upper and lower teeth) appropriately sized to fit the teeth (ridge) and over the gum line of a patient. Magnetic nano or microparticles can be manipulated within a ferrofluid mixture by a magnetic field. The ferrofluid, teeth and gumline can be illuminated by a light source from or through the mouth tray.

Method of separating a mixture of scrap particles into fractions with different mass densities, comprising: feeding the mixture of scrap particles into a volume of ferrofluid held in a magnetic field configured for magnetic density separation of the scrap particles in the volume of ferrofluid; using the magnetic field, by the principle of magnetic density separation, causing the scrap particles in the volume of ferrofluid to become spatially distributed according to their mass densities along a separation direction having a horizontal component; while at least partly maintaining the spatial distribution, removing the scrap particles along a removal direction out of the volume of ferrofluid, the removal direction being substantially transverse to the separation direction; and, using the at least partially maintained spatial distribution, separating the removed scrap particles into fractions with different mass densities.

The invention discloses an in-vivo ferrofluid drug transport performance testing device and a testing method. The device comprises a mounting table, a ferrofluid loading device and a ferrofluid loading device, the test board is mounted on the mounting table, a test substrate is arranged on the test board, the test substrate is used for placing ferrofluid droplets, and the ferrofluid droplets are wrapped with fluorescent particles; the moving module is mounted on the mounting table, the moving module is provided with a supporting column capable of moving front and back, the supporting column is provided with a movable table capable of moving up and down, and a magnetic block is arranged on the movable table and located below the test table; a shooting area of the camera faces the test substrate; and a light-emitting area of the excitation light source faces the test substrate. Compared with the prior art, the technology has the advantages that quantitative determination of the Roussonii instability critical magnetic field is realized, a reliable basis is provided for optimizing magnetic field parameters, and the leakage rate of the nano-drug in the targeted transportation process is accurately quantified by shooting and analyzing the residual path of the fluorescent particles during targeted transportation of the ferrofluid droplets; the method has the advantages of high repeatability, reliable detection and the like.

This invention provides a non-invasive on-chip droplet segmentation magnetron splicing chip, relating to the field of microfluidic chips. The non-invasive on-chip droplet segmentation magnetron splicing chip provided by this invention includes a top chip, a permanent magnet layer, and a bottom chip sequentially packaged. The top of the top chip is provided with a clamp-shaped liquid separation opening. The clamp-shaped liquid separation opening includes a main channel and multiple clamp-shaped flow channels. Each clamp-shaped flow channel is located on the same side of the main channel and is sequentially arranged along the extension direction of the main channel. The clamp-shaped flow channels include a horizontal flow channel and an oblique flow channel connected in sequence. The extension direction of the horizontal flow channel is consistent with the extension direction of the main channel, while the extension direction of the oblique flow channel deviates outward from the extension direction of the main channel. This invention eliminates the need for magnetic additives. Using oil-based ferrofluid to transport sample droplets and performing liquid separation through clamp-shaped flow channels not only simplifies the preparation process but also eliminates the need to magnetize the sample, preventing contamination of the sample droplets.

The invention discloses a tactile feedback electromagnetic actuator based on ferrofluid. The performance of the electromagnetic actuator is enhanced by using the ferrofluid. The high thermal conductivity of the ferrofluid is beneficial to heat dissipation, and the parametric magnetic performance of the ferrofluid reduces the magnetic resistance of an electromagnetic circuit, so that the generated force is increased. Due to the fact that the heat dissipation problem is solved, the tactile feedback electromagnetic actuator based on the ferrofluid can be compact in layout, the size of the tactile feedback electromagnetic actuator can be designed to be equal to the size of a small handheld object or the fingertip of an adult, and the tactile feedback electromagnetic actuator can be easily integrated into various devices. In addition, two axially aligned permanent magnets and a copper electromagnetic coil are wound around the high-permeability electromagnetic iron core. According to the design, larger force is generated under the condition that the size is not increased, and compared with a traditional electromagnetic actuator, the electromagnetic actuator can be operated in a wider frequency range and can generate continuous force, instantaneous force or oscillating force, and the wide sensing capacity of human touch sense is simulated.

A method of separating a mixture of waste particles into particle size fractions having different mass densities, the method comprising: feeding the mixture of waste particles into a volume of ferromagnetic fluid held in a magnetic field configured for magnetic density separation of waste particles in the volume of ferromagnetic fluid; by utilizing a magnetic field and a magnetic density separation principle, waste particles in a certain volume of ferrofluid are spatially distributed along a separation direction with a horizontal component according to the mass density of the waste particles; removing the waste particles from the volume of ferromagnetic fluid along a removal direction substantially transverse to the separation direction while at least partially maintaining the spatial distribution; and separating the removed waste particles into particle size fractions having different mass densities using the at least partially maintained spatial distribution.

An electronically-controlled digital ferrofluidic device is disclosed which employs a network of individually addressable coils in conjunction with one or more movable permanent magnets, where each moveable permanent magnet delivers the designated fluid manipulation-based tasks. The underlying mechanism facilitating fluidic operations is realized by addressable electromagnetic actuation of miniaturized mobile magnets that exert localized magnetic body forces on droplets filled with magnetic nanoparticles. The reconfigurable, contactless, and non-interfering magnetic-field operation properties of the underlying actuation mechanism allow for the integration of passive and active components to implement advanced and diverse operations with high efficiency (e.g., droplet sorting, dispensing, generation, merging, mixing, filtering, and analysis).

A method for analysing a device for spraying a pharmaceutical fluid product, the method including the steps of providing a spraying head including a spray opening; providing a receiving zone forming a container the bottom of which is formed by a plate behind which a camera is arranged, the container containing a ferrofluid; providing, under the plate, a set of magnets generating a magnetic charge to force the ferrofluid to cover the plate; passing a stream of gas through the spraying opening, and sending it over the receiving zone, the ferrofluid that is hit by the stream of gas being moved over the plate to form an impact zone; viewing the impact zone with the camera; and analysing the view of the impact zone in order to determine whether or not the impact zone complies with predetermined specifications.

A heat transfer device 10 comprising a body defining a fluid circuit containing a ferrofluid, passing in proximity to a first surface 112 and a second surface 114, transferring heat between the surfac

The utility model discloses a ferrofluid filling device which comprises a liquid storage tank and an anti-dripping assembly. The liquid storage tank comprises a conveying pump fixedly installed on one side of the liquid storage tank. According to the ferrofluid filling device, after the filling device on the outer side of the liquid storage tank completes filling of ferrofluid, the floating block and the indicating rod on one side in the filling device are lifted so as to indicate completion of filling operation, meanwhile, after filling of the ferrofluid is completed, the threaded rod in the fixing sleeve can be screwed, and the filling operation is completed. The plugging block is pressed in the liquid inlet cavity through the screw rod to plug the liquid inlet cavity, so that after the ferrofluid is filled by the filling device, the liquid inlet cavity at the bottom of the filling device is plugged through the plugging block, and the problems that the ferrofluid drips on a filling workpiece and is wasted due to the fact that the filling device is taken down and residual ferrofluid in the internal liquid inlet cavity flows out are solved; and the floating block and the indicating rod in the filler can also flexibly identify the filling and filling of the ferrofluid in various parts through the indication in the filling and filling of the ferrofluid.

The application relates to the technical field of sewage treatment, and discloses an energy-saving and environment-friendly multiple sewage treatment device and a use method, which comprise a processor and two baffles installed on the processor, the two baffles divide the interior of the processor into a mixing zone, a reaction zone and a sedimentation zone, a plurality of groups of reaction tubes are installed between the two baffles and are communicated with the mixing zone and the sedimentation zone at two ends. 3+ The moving catalyst enrichment zone formed by the ferromagnetic fluid driven by the traveling wave magnetic field, the pulse magnetic field and Fe 2+ / Fe 2+ circulation generates a large number of hydroxyl radicals, an auxiliary electric field supplements H2O2 and Fe in situ, and the three cooperate to continuously and efficiently generate ·OH, so that organic pollutants can be quickly mineralized, chemical oxygen demand can be significantly reduced, toxic and harmful organic matters can be degraded, and chroma can be eliminated.

The invention discloses a magnetic control underwater multiphase interface visible light permeability structure manufacturing and tuning method, relates to the technical field of underwater optical interface regulation and control, and solves the problems of irreversible interface morphology, limited dimming amplitude, poor underwater stability and the like in a traditional interface regulation and control system. The method specifically comprises the following steps: constructing a micro-column structure through femtosecond laser direct writing: processing the micro-column structure on a rigid substrate surface array by adopting a femtosecond laser direct writing technology; modifying the surface of the micro-column structure: performing super-hydrophobic treatment on the surface of the micro-column structure, and modifying the surface of the substrate to be super-hydrophobic; injecting ferrofluid: inversely immersing the modified micro-column structure substrate in water, and injecting oil base-ferrofluid into a micro-column structure area. According to the sandwich structure, reversible movement of the ferrofluid is achieved in the underwater environment, and the problem that a traditional liquid film or interface system is prone to collapse and unrecoverable is solved.

The flexible magnetic field focusing and shear wave noise reducing electromagnetic-acoustic detection probe based on ferromagnetic fluid and method thereof, the probe comprises a flexible coil, a ferromagnetic fluid device, a permanent magnet and a shell device. The flexible coil is located at the bottom of the probe and is used for exciting and receiving signals; the ferromagnetic fluid device is located above the coil and has the characteristics of high magnetic permeability, difficult propagation of shear waves, fluid flow and incompressibility, thereby playing the roles of focusing the surface magnetic field, reducing the shear wave noise in the permanent magnet and pressing the coil to adhere to the surface of the pipeline; the flexible coil and the ferromagnetic fluid used in the application enhance the sensitivity of the pulse eddy current detection and the amplitude of the electromagnetic ultrasonic detection signal by enhancing the induced eddy current density and the bias magnetic field strength on the surface of the pipeline; on the other hand, the detection signal-to-noise ratio of the probe is improved by reducing the shear wave noise in the permanent magnet; meanwhile, the purpose and effect of synchronous detection of the inner and outer wall defects of the pipeline are achieved through a signal separation method.

A system can include a cooling plate configured for dissipating heat from a processor or other heat-generating component. The cooling plate can include a body defining a coolant chamber having a coolant inlet and a coolant outlet. An amount of ferrofluid within the coolant chamber can be arrangeable to at least partially define one or more guides for coolant flow within the coolant chamber between the coolant inlet and the coolant outlet. A magnetic field emitter can be positioned relative to the body so as to be operable to alter an arrangement of the ferrofluid within the coolant chamber to adjust a physical characteristic (such as size, shape, and / or location) of at least one of the one or more guides for coolant flow within the coolant chamber between the coolant inlet and the coolant outlet.

This invention discloses a microplastic removal device for wastewater, comprising a base plate, a mounting base fixedly connected to the top of the base plate, screws installed inside the mounting base, a stirring container installed inside the mounting base by screws, a stirring mechanism inside the stirring container, a first water pipe fixedly connected inside the stirring container, a filter box installed on the top of the base plate, and four first L-shaped fixing plates symmetrically fixedly connected to the outside of the filter box, the first L-shaped fixing plates being bolted to the base plate. The beneficial effects of this invention are: by adding a magnetic block and placing the magnetic block in a slot, direct contact between the magnetic block and the ferromagnetic fluid is avoided. When cleaning, simply remove the magnetic block from the slot, and the ferromagnetic fluid will automatically fall off due to the loss of magnetic attraction. By adding a first water pipe, which is Z-shaped, the traditional mechanical device of a siphon is used for water transport, ensuring that the wastewater can completely flow into the filter box.

The invention discloses a ferromagnetic fluid pump experiment device with repeatability, variable structural parameters and visualization. The ferromagnetic fluid pump experiment device comprises a pump cavity composition mechanism, a pump cavity supporting mechanism, a fixed magnet and a rotary magnet. The pump cavity composition mechanism comprises a pump cavity upper cover plate, a pump cavity upper cover plate sealing gasket, a pump cavity special-shaped structure, a pump cavity lower cover plate sealing gasket and a pump cavity lower cover plate; a pump cavity internal circular structure is arranged in the pump cavity, and an annular micro-channel is formed between the pump cavity internal circular structure and the pump cavity special-shaped structure; a pump cavity internal circular structure upper sealing gasket and a pump cavity internal circular structure lower sealing gasket are respectively arranged above and below the pump cavity internal circular structure; a fixed ferromagnetic fluid and a piston ferromagnetic fluid are arranged in the annular micro-channel; a fixed magnet is arranged on the upper side of the pump cavity upper cover plate; a rotating magnet is arranged on the lower side of the pump cavity lower cover plate. According to the invention, one set of device can be used for testing various different working conditions, so that system errors caused by replacement of experimental equipment are avoided, and meanwhile, material waste caused by redundant processing is also avoided.

Sealing arrangement for sealing a vacuum side (6) from an ambient side (7), with a ferrofluid seal (4) between a rotatable shaft (2) and a housing (3), characterized in that the sealing arrangement (1) between the ferrofluid seal (4) and the vacuum side (6) has a switchable additional seal (5) which can be switched between an out-of-service position without sealing function and a sealing position in which the shaft (2) is sealed to the vacuum side (6) via the additional seal (5).

The application discloses a four-drive magnetic source ferromagnetic fluid micro-pump with embedded fixed magnetic sources, and belongs to the technical field of micro-fluid transmission control. The micro-pump comprises a pump body provided with a circular pump cavity, ferromagnetic fluid accommodated in the pump cavity, and a magnetic source system composed of a fixed magnetic source and four rotatable driving magnetic sources. Two driving magnetic sources are arranged on two sides of the pump cavity in each group, and can synchronously rotate around the axis of the pump cavity. The fixed magnetic source and the driving magnetic sources form a five-magnetic-source coupling structure, and a uniform and efficient superimposed magnetic field is generated in the circular pump cavity, so that the ferromagnetic fluid is magnetized to form a stable 'driving disc'. The driving disc rotates with the driving magnetic sources and periodically changes the volume of the pump cavity, so that the fluid is directionally pumped from the liquid inlet to the liquid outlet. Through the multi-magnetic-source coupling and rotary driving design, the magnetic field force and uniformity are significantly enhanced, the driving force, the back pressure resistance, the operation stability and the rotating speed of the micro-pump are effectively improved, and the pollution risk of the magnetic fluid is reduced.

A physical random number generator based on the optical detection of magnetically induced fluid turbulence, comprising: a. a transparent container (10) with a volume of ferrofluid (12); b. an arrangement of at least two electromagnetic coils (20A, 20B) positioned such that they expose the ferrofluid (12) to fluctuating magnetic fields; c. a computer (70) configured to output independent, variable power signals (52A, 52B) to the electromagnet coils (20A, 20B) to induce chaotic 3D peak formations and turbulent structures (14) in the ferrofluid (12); d. an optical measuring system comprising a laser source (30) configured to emit a beam (32) through the transparent container (10) and a light sensor (40) configured to detect the fluctuations in the beam (34) caused by the turbulent structures (14); e. the method is characterized in that the computer (70) is further configured to receive an analog raw signal (42) from the light sensor (40) and digitizes and processes this signal to generate a final true random number (62) within a single hardware architecture.

An autonomous navigation control system for a reconfigurable ferrofluid droplet robot includes: a distributed magnetic field generation unit, which is composed of multiple electromagnets and can generate a local non-uniform gradient magnetic field; an environmental perception unit uses a visual system to detect the position information of the robot and obstacles in real time, and performs multi-target detection, tracking and positioning; a motion planning unit uses a path planning algorithm based on environmental information to plan a collision-free path for the robot formation and update it in real time; a closed-loop controller adjusts the robot's motion state based on feedback information and dynamically controls its shape change to adapt to environmental changes; a drive control unit controls the coordinated movement of the robot group based on control signals. The system design of the present invention solves the problems of poor adaptability and single functional form of traditional micro-nano robot systems, significantly improves the flexibility and efficiency of operations, and broadens its application prospects in the fields of drug delivery, biosensing, environmental remediation, etc.

The invention is directed to a method and a system for producing a ferrofluid comprising providing a stock solution with Fe(II) and Fe(III); mixing the stock solution with a base to form magnetic nanoparticles and a spent solution, said method further comprising a separation step of separating the nanoparticles from the spent solution by applying a magnet to immobilize the nanoparticles and remove at least part of the spent solution as supernatant from the immobilized nanoparticles. In another aspect, the invention is directed to the resulting ferrofluid.

In some embodiments, a downhole logging tool configured for placement in a wellbore comprises a first magnet configured to activate a first volume of ferromagnetic fluid disposed between the downhole logging tool and the wellbore to achieve a first seal between a primary analysis region of the downhole logging tool and a wellbore fluid.

The invention provides a non-invasive on-chip droplet segmentation magnetic control chip, and relates to the field of micro-fluidic chips. The non-intrusive on-chip droplet segmentation magnetic control chip provided by the invention comprises an upper-layer chip, a permanent magnet layer and a lower-layer chip which are packaged in sequence, a pincerlike liquid separation opening is arranged at the top of the upper-layer chip; the pincerlike liquid separation open groove comprises a main runner and a plurality of pincerlike runners; the pincerlike runners are located on the same side of the main runner and are sequentially arranged in the extending direction of the main runner; the pincerlike flow channel comprises a flat flow channel and an inclined flow channel which are communicated in sequence; the extension direction of the flat runner is consistent with that of the main runner, and the extension direction of the inclined runner outwards deviates from that of the main runner. Magnetic additives do not need to be added, the oil-based ferrofluid is used for transporting the sample liquid drops, liquid separation is carried out through the pincer-shaped flow channel, the process of preparatory work can be simplified, the sample does not need to be endowed with magnetism, and the sample liquid drops are prevented from being polluted.

The present application relates to a ferrofluid control device, which generates two different magnetic fields by placing the first magnetic conductor and the second magnetic conductor at different positions of the first coil group, thereby enabling the ferrofluid to produce more abundant dancing effects. Furthermore, a richer dancing effect can be realized by adding the second coil group and the third magnetic conductor.

The invention discloses a coreless axial flux motor with air gaps filled with ferrofluid and a design method thereof, the coreless axial flux motor with the air gaps filled with the ferrofluid comprises a stator with a stator winding and a rotor with permanent magnets, the air gaps are formed between the stator and the rotor, and the air gaps are filled with the ferrofluid; the design method comprises the steps of generating a current motor design scheme according to structure parameters of the coreless axial flux motor; establishing a motor model of the coreless axial flux motor according to the current motor design scheme, and calculating the power required by ferrofluid friction loss to be overcome by rotor rotation; and if the power does not meet the preset constraint condition, adjusting the structural parameters of the coreless axial flux motor, and repeating the steps until an optimal current motor design scheme is obtained. The invention aims to solve the problem of low air gap magnetic flux density of a traditional coreless axial magnetic flux motor and improve the heat dissipation performance of the coreless axial magnetic flux motor.

The invention provides a particle sorting micro-fluidic chip based on viscoelastic iron fluid and a preparation method of the particle sorting micro-fluidic chip. The particle sorting micro-fluidic chip comprises a first inlet, a branch channel, a magnet, a first sorting module and a second sorting module, the first inlet is connected with one end of the branch channel, and the first sorting module and the second sorting module are connected with the other end of the branch channel; the magnet is positioned between the first sorting module and the second sorting module; a mixed solution of viscoelastic iron fluid and two kinds of particles is injected from the first inlet and equivalently flows into the first sorting module and the second sorting module through the branch channel. The method can realize continuous and sheath-free separation of particles with different sizes, and has the advantages of high flux, small structure size, no need of magnetic bead modification, simple operation and the like.

A device for generating a variable angular momentum for attitude control of a spacecraft includes a rotor and a stator on which the rotor is mounted and a means for driving the rotor via a rotating magnetic field. A bearing is formed by a fluid film of a ferrofluid between opposite bearing surfaces of the rotor and the stator. The fluid film is interrupted by one or more gas inclusions. The bearing preferably extends about the central axis over a region that has a smaller radius than the rotor. One or more permanent magnets are arranged on the rotor or on the stator in the region of the bearing, wherein the ferrofluid is held in a fixed position relative to the rotor or the stator and a magnetic pressure is generated in the ferrofluid by the one or more permanent magnets.

The present invention discloses a wearable legging based on ferrofluid, belonging to the technical field of magnetic fluid devices. The wearable legging based on ferrofluid comprises a legging body and a flexible supercapacitor and rectifier module. The flexible supercapacitor and rectifier module form the circuit portion and have a built-in EHC (Energy Collection and Conversion) module, which is an energy collection and conversion module composed of a super-flexible supercapacitor and a rectifier. The legging body comprises two legs, each wrapped with a bandage fixed to the left and right legs, with a crotch piece disposed between the two bandages. Flexible permanent magnetic sheets are fixedly connected to the outer sides of the legging body, with the two flexible permanent magnetic sheets located on the outer sides of the two bandages, and ferrofluid fabric is sewn on the front and back sides of the bandages. The present invention replaces the hard solids used in the prior art, such as permanent magnets, coils, and containers, with flexible magnetic materials, making the human body mechanical energy collection device based on magnetic fluid easy to wear and easy to connect.

The present invention discloses a method for manufacturing an optical fiber magnetic field sensor composed of Fe3O4 ferromagnetic fluid, comprising the following steps: a first step of manufacturing a Fabry-Perot interferometer 1 (FPI1); a second step of manufacturing a capillary tube + single-mode optical fiber fusion splicing structure; and a third step of manufacturing a Fabry-Perot interferometer 2 (FPI2). The present invention utilizes ferromagnetic Fe3O4 nanoparticle material to design an FPI2 that is relatively sensitive to a magnetic field. Then, utilizing the principle of an optical vernier effect, a cascade structure of FPI1 and FPI2 is constructed to generate a vernier effect, thereby forming a vernier effect magnetic field sensor. The vernier effect magnetic field sensor can further amplify the magnetic field sensitivity, thereby obtaining an optical fiber magnetic field sensor that is extremely sensitive to magnetic field intensity. The optical fiber magnetic field sensor manufactured using the method of the present invention has a compact structure, is easy to manufacture and package, and has high sensitivity.